erp5_mrp: group on delivery for category 'specialise'

bt5/erp5_mrp/PathTemplateItem/portal_deliveries/manufacturing_order_builder/category_movement_group_on_delivery.xml

@@ -45,6 +45,7 @@
                 <string>destination_project</string>
                 <string>source_payment</string>
                 <string>destination_payment</string>
+                <string>specialise</string>
               </tuple>
             </value>
         </item>